#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int g_val = 0;
int main()
{
	pid_t id = fork();
	if(id < 0)
	{
		perror("fork");
		return 0;
	}
	else if(id == 0)
	{ //child
		printf("child pid %d : %d : %p\n", getpid(), g_val, &g_val);
	}
	else
	{ //parent
		printf("parent pid %d : %d : %p\n", getpid(), g_val, &g_val);
	}
	sleep(1);
	return 0;
}
